Nag is a Web-based application built upon the Horde Application Framework that provides a simple, clean interface for managing online task lists (i.e. TODO lists). It includes strong integration with the other Horde applications and offers shared task lists.

Taskwarrior (formerly known as task) is a command-line to do list manager. It is scope-limited to GTD functionality and features tags, colorful tabular output, reports and graphs, lots of commands, completion, 256-colors, themes, multi-user file locking, and recurring tasks.

TimeGT is powerful life and task management software that keeps data in sync using a secure server. It offers numerous ways to organize tasks, ideas, and notes. It will suit a wide range of time management techniques used by different people. The following filters are available and can be used in any combination: a project tree of arbitrary depth; task life-cycle supporting Timing folders (supports GTD method); any number of Tags added to a task and used for filtering; and a Start and Due dates based Horizon filter. It keeps tasks up-to-date between any number of computers. Tasks are mediated through the dedicated secure Sync server, and are protected when they travel over the Internet (RSA of adequate length is used). Information is accessible everywhere.

CiWiki is a lightweight and easy-to-use personal wiki. It is a fork of DidiWiki with support for restoring previous pages, playing videos from Youtube, Dailymotion, Vimeo, and Veoh, and changing text and highlight colors. Login and page permissions protect the wiki.

PySuite is a collection of Python Vim plugins. You need Vim compiled with python to use them. It includes: an
outliner similar to TVO; a todo list manager; a project manager (load/unload by directory/project, make an outline of Python files, etc); a calendar that supports adding notes to dates; a plugin to track expenses and balances; a sortable table with fields separated by 2+ spaces; resize (set a list of main Vim window sizes and use two shortcuts to resize -/+); helpgrep (enter a few words and use :helpgrep cmd to search for them in any order); pystripdoc (make a copy of the buffer with stripped out Python docstrings and comments); pyfolddoc (fold Python docstrings and comments); and
aligncode (align code by '=' or '#' chars).

Outliner Lighto is a console-based outliner/hierarchical editor. An outliner is used to edit an hierarchy of text (a tree with text in every node). This hierarchy can represent anything the user wants, like TODO lists, calendar, tasks, address book, bookmarks, etc. It is based on FreePascal's video and keyboard units.